Chair detail.



E. R. THIEL.

CHAIR DETAIL.

PPLICATION FILED FEB. 20. 1915.

LQQGAW. Patented May15,1917.

2 SHEETSSHEET I.

Witnesses 78, of. PM.

E. R. THIEL.

CHAIR DETAIL.

APPLICATION FILED FEB. 20. 1915.

LQQBAIO. Patented May15,1917.

2 SHEETS-SHEET 2.

Witnesses UNTTED %TATE% PATENT @FFTQE.

ERVIN IR. THIEL, OF SHEBOYG-AN, WISCONSIN, ASSIGNOB, TO GILSON MANUFACTURING COMPANY, 01'! PORT WASHINGTON, WISCONSIN.

CHAIR DETAIL.

Specification of Letters Patent.

Patented May 15, 1191?.

Application filed February 20, 1915. Serial No. 9,623.

To all whom it may concern:

Be it known that I, ERVIN R. THIEL, a citizen of the United States, residing at Sheboygan, in the county of Sheboygan and State of Wisconsin, have invented a new and useful Chair Detail, of which the following is a specification.

The device forming the subject matter of this application is a means whereby the seat of a chair may be supported for rotation and for raising and lowering.

The primary object of the invention is to provide a device of the sort above mentioned in which the seat will remain firm when adjusted at different heights, all lateral or wabbling motion being avoided by reason of the fact that the seat is carried by a shaft, the lower end of which at all times has a firm and secure thrust bearing, the weight of the seat and the occupant thereon, being carried by means of the shaft, directly into a shaft supporting socket, as distinguished from the adjusting nut whereby the seat supporting shaft is raised and lowered.

A further object of the invention is to improve generallyand to enhance the utility of devices of that type to which the present invention appertains, novel features being brought out as the description progresses and ultimately being specifically claimed.

. In chair irons of the type to which my invention pertains, there is present always more or less wabble due to the fact that the nested parts which form the radial bearing depend upon the contact of threads for the ultimate support and, in practice, a threaded connection must alwayshave more or less play in order to perform its proper functions. Hence, although there may be a practically smooth bearing between two of the parts, this threaded element, which forms a hearing,- will, in conjunction with the necessary play in the smooth bearing, de velop considerable lateral movement or Wabble. To overcome these objections my peculiar assemblage of the nested parts is such that the chair supporting shaft receives a direct bearing in the bore of the base, independent of the sleeve socket, which sleeve socket also receives a direct uninterrupted bearing in the bore of the base. Hence the chair supporting shaft and sleeve socket have independent bearing in the bore of the base in the nature of a ground fit, which will eliminate all tendency to wabble or play laterally and the parts so arranged will wear indefinitely without developing appreciable lost motion or shackle.

With the above and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings Figure 1 shows the invention in side ele vation;

Fig. 2 is a fragmental vertical section showing in detail the means whereby the seat frame is pivotally connected with the supporting shaft;

Fig. 3 is a top plan of the seat frame and attendant parts;

Fig. 4c is an elevation wherein the structure is viewed at right angles to the showing of Fig. 1;

Fig. 5 is a fragmental vertical section illustrating the means whereby the seat is raised, lowered and sustained;

Fig. 6 is a cross section on the line 66 of Fig. 5; 1

Fig. 7 is a cross section on the line 77 of Fig. 5.

In carrying out the present invention there is provided a leg holding base 1 embodying an integral top plate 2 provided with openings 8. The base 1 is equipped with a vertical, circular bore 4, and opening into the bore 4 are longitudinal guide slots 5, the bore and the guide slots preferably extending entirely through the base 1. In the outer face of the base 1 longitudinal recesses 6 are formed, below the top plate 2, the recesses 6 being adapted to receive the ends of legs 7 Disposed against the under edges of the legs Tand if desired abutting against the lower end of the base 1 is a bottom plate 8, provided with openings 9. Bolts 10 or other securing elements adapted to a like end pass through the openings 9 in the bot tom plate 8, through the legs 7 of the chair and through the top plate 2, the legs 7 thus being held firmly assembled with the base 1. Upstanding from the base 1 is an car 11 into The sleeve socket 14 is of skeletonized tubular form and embodies a bottom 15 of con siderable thickness and strength. The sleeve socket 14 is provided with longitudinal slots 16 defining longitudinal ribs 17 fitting slid-ably in the guide slots 5 of the base 1. The construction, therefore, is such that although the socket 14 may be moved vertically in the base 1, the sleeve socket cannot rotate therein, owing to the engagement between the ribs 17 of the socket and the guide slots 5 of the base bore 4.

A means is provided forraising and lowering the socket 14, and with this end in view the socket is externally threaded as shown at 18 to engage a hand wheel 19, the hub 20 of which bears against the upper end of the base 1. The hub 20 of the hand wheel 19 is provided with an outstanding flange 21, above which engages the set screw '12 in the car '11 on the base 1, the construction being such that the hand wheel 19 is held to the basel for rotation but against movement in a vertical direction.

The invention comprises a shaft 22 preferably fashioned from steel and journaled for rotation in the socket 14. Noting the point at which the reference character 23 is applied in Fig. 5, it will be observed that the'lower end of the chair supporting shaft 22 is'rounded and bears directly upon the solid bottom 15 of the socket 14. The shaft 22, therefore is supported for rotation independently of the hand wheel 19. In order to prevent the shaft 22 from being pulled out of the socket-14 when the chair is lifted, and under like conditions, the shaft is equippedwith a circumscribing groove 24 receiving loosely the inner end of a screw 25 or like projection mounted in the socket 14. It is to be observed, however that the groove 24 is wide enough sothat no weight comes on the screw 25, the weight being carried directly into the bottom 15 of the socket l4.

By means of a pin 26, a head 27 is attached to the upper end of the shaft 22,

although other attaching means may be resorted to if deemed expedient. The head. 27 is provided with upstanding side ears 28.

A seat supporting frame 29 constitutes a part of the invention, the outline of the frame 29 being shown in Fig. 3. Upon the frame 29 rests a seat 30, the frame being provided adjacent its corners with openings 31 adapted to receive the securing elements whereby the seat is held on the frame.

'The seat frame 29 is'shown as comprising side bars 32, end bars 33 and a cross brace 34, the latter including a lip 35. The side bars 32 of the seat frame 29 are provided 'with depending cars '36 overlapped upon the ears 28 of the head 27 as shown in Fig.

4. Through the'ears28 and {36 extends a pivot element 37 upon which the seat frame 29 is supported for tilting movement.

Surrounding the pivot element 37 loosely A isa helical spring 38,.the ends 39,of,;which bear against a stop rib 40 on the head 27.

Intermediate its ends, the helicalfspring 38 is formed into an upstanding loop 41'which,

as shown in Fig. 2, is engaged by ahead 42 formed on one end of a screw 43'mounted to movelongitudinally for adjustment 1n a flange .44 depending from the cross brace 34 of the seat frame 29. Threaded onto the screw 43 and abutting against the flange 44 is a hand wheel 45, the hub 47 of: which 7 i is received for rotation within a collar 46 outstanding from the flange 44. r i In practical operatlon, the seat frame 29 is raised and lowered by manipulating the' hand wheel 19, especial attention being directed to the fact that the shaft 22 is not threaded into the hand Wheel, but abuts at its lower end directly against the bottom 15 of the socket l4. Owing to this feature, as hereinbefore Yintimated, an unusually strong construction is afforded, and lost motion is avoided, it being. observed that'the lower end 23 of the shaft 22 always has a' firm abutment against the bottom 15 of the adjusted through the medium of the hand wheel 45 and the screw- 43.

It is to be observed that the lip 35 ex tends above the loop 41 0f the spring 38 and shields theend of the adjusting element or screw 43. The loop-engaged end of the screw 43, therefore, is protected by the lip and the screw is not' likely to be bent accidentally.

- Generally considered, the device is so constructed that it may be taken down readily to facilitate shipment. f

Having thus described the invention, what is claimed is 1. A chair iron comprisinga base'member having a bore provided with guidefslots "paralleling its axis,an externally threaded sleeve socket, the same comprising a series of longitudinal slots defining ribsjwhich form a shaft receivingbore of approxi mately the same size as the base bore, the

ribs being slidable in the base guide slots,

athreaded hub supported by the base engaging the threads of the sleeve socket, and 'a chair-supporting shaft 'mounted in said sleeve.

chair iron comprising a base memher having a bore provided with guide slots paralleling its axis, an exteriorly threaded sleeve socket comprising a series of longitudinal slots, defining ribs which form a shaft receiving bore of a diameter at least equal to the diameter of the base bore, the ribs of the sleeve being in slidable union with the base guide slots, a threaded hub engageable with the threaded portion of the sleeve socket, and a chair supporting shaft journaled in the sleeve bore and in the bore of the base, the shaft being supported by said sleeve.

3. A chair iron comprising a base member having a bore provided with two or more guide slots, an exteriorly threaded sleeve socket embodying two or more axially alined ribs which together form a shaft receiving bore of a diameter at least equal to the bore of the hub, the ribs being in slidable union with the base slots, a shaft journaled in the sleeve socket bore and also journaled in the hub bore, the shaft being supported by said sleeve.

4. In a chair iron, a bored base having longitudinal guide slots extending therethrough, a bored skeleton sleeve socket in telescopic union with the bore of the base having ribs that are fitted in the base guide slots, a chair supporting shaft adapted to be journaled both in the bore of the sleeve socket and base whereby it is supported against radial play ultimately in the base, and means for raising and lowering the skeleton sleeve, the shaft being supported by said sleeve.

5. A chair-iron comprising a base member having a bore provided with guide slots paralleling its axis, a skeleton sleeve socket comprising a series of axially alined ribs forming a smooth shaft receiving bore of a Size at least equal to the bore of the base the ribs being slidable in the guide-slots of said base, threads extending from the upper end of the sleeve socket throughout approximately half its length, a threaded hub supported upon the base engageable with the sleeve socket threads, and a chair supporting shaft journaled in the bore of the aforesaid sleeve socket and engageable with the bore of the base, the shaft being supported by said sleeve.

6. A chair-iron comprising a base member having a bore provided with guide-slots paralleling its axis, a skeleton sleeve socket comprising a series of axially alined ribs forming a shaft receiving bore of a diameter at least equal to the bore of the base, the ribs being in slidable union with the guideslots of said base, means for raising and lowering the sleeve socket within the base bore, and a chair supporting shaft j ournaled in the bore of said sleeve socket and also in the bore of the aforesaid base, the shaft being supported by the sleeve.

In testimony that I claim the foregoing as my own, I have hereto affixed my sigma--- ture in the presence of two witnesses.

ERVIN R. THIEL Witnesses:

J ACOB HIKER WHANSER, OTTO B. SCHAF.

Gopies of this patent mav be obtained for five cents each, by addressing the Commissioner of Patents. Washington. D. G. 

